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Jimmy Jansen

Career Highlights

I like turning messy systems into something that actually works and ships

Principal Engineer

Storyteq B.V.
Current
website

I work on our video platform, which is really several products stitched together over the years. My job is making them work as one platform for the customers using them, the teams building them, and the people keeping them running. My work spans teams, systems, and leadership levels, connecting technical direction with delivery reality.

Key Achievements

  • Leading the platform rollout across regions, existing customers, and internal product teams — sequencing migrations and coexistence so live customer workflows kept running through the cutover
  • Stabilizing a tightly-coupled legacy estate where shared databases, chained services, and deploy coupling meant one team's change could break another team's product — redrawing service and data boundaries so teams can ship independently
  • Unifying three overlapping products into one platform — federation first so existing customers kept the surface they knew, moving toward a shared core that gives every customer the best of what each product had
  • Designing the rendering architecture for high-volume templated video — one creative fans out to many platform and market variants, in long-running bursts, across tenants — focused on fair scheduling, template-level reuse, and deadline-aware queueing
  • Establishing the architecture-decision practices the org now runs on — ADRs, RFCs, and design reviews adopted across most teams — and pushing end-to-end ownership of each domain into the teams that build it
  • Driving delivery safety as the default — feature flags, CI/CD discipline, and reliability ownership as the way teams ship, not the exception

Approach & Impact

  • I treat decisions as artefacts. If it's worth doing, it's worth an ADR — and if no one can find the ADR later, the decision didn't really happen.
  • I'd rather make a domain boundary clear than perfect. Most architecture pain comes from fuzzy ownership, not bad code.
  • I work hardest on the parts of a system that only a few people understand. Knowledge concentrated in heads is a load-bearing dependency, and I’d rather pay it down than route around it.
  • I connect technical direction with delivery reality — which mostly means saying no to clean architectures that won't survive contact with how teams actually ship.

Technology Stack

Architecture:
System Design Microservices Microfrontends REST APIs Documentation
Frontend:
Vue Angular React TypeScript
Backend:
Node.js Java PostgreSQL MySQL GraphQL
DevOps & Cloud:
Docker Kubernetes Helm GCP CI/CD Pipelines
Leadership:
Team Leadership Mentoring Technical Strategy Stakeholder Management

Staff Software Engineer

Rangle.io
website

I worked as a consultant for various clients, from startups to large enterprises. I helped teams solve technical problems, modernize legacy systems, and improve performance.

Key Achievements

  • Worked on 30+ client projects across different industries
  • Helped modernize a 10M+ line legacy codebase, solving key issues, improving performance and reducing complexity
  • Mentored developers across multiple client projects
  • Supported several early-stage startups in getting their products to market
  • Spent a lot of time pair programming, running technical workshops, and mentoring developers
  • Built scalable architectures using modern cloud-native technologies

Approach & Impact

  • Managed multiple concurrent client projects effectively
  • Adapted quickly across unfamiliar domains, stacks, and client environments
  • Helped align business, design, and engineering teams

Technology Stack

Architecture:
Microservices System Design API Design Legacy Modernization Performance Optimization
Frontend:
React Next.js TypeScript
Mobile:
React Native iOS Android Mobile UI/UX
Backend:
Node.js REST APIs MongoDB PostgreSQL
DevOps & Cloud:
Docker Kubernetes AWS Azure GCP CI/CD Pipelines
Leadership:
Client Management Technical Mentoring Workshop Facilitation Cross-functional Collaboration

Senior Software Engineer

Albelli
website

Over 5 years at Albelli, I worked on their mobile app for iOS and Android. The app grew from a small project to a significant revenue channel. I helped build features for photo products and improved the app's performance.

Key Achievements

  • Built a 3D mug customization feature
  • Worked on product flows for books, calendars, mugs, and wall decor
  • Improved our CI/CD pipeline to make builds faster and more reliable
  • Led the migration from Cordova to a custom hybrid framework for better performance

Approach & Impact

  • Mentored junior developers through regular pairing sessions
  • Set up comprehensive testing to reduce production bugs
  • Optimized app performance for faster startup and lower memory usage
  • Developed hybrid app patterns that other teams could reuse

Technology Stack

Frontend:
React TypeScript JavaScript
Mobile:
Swift (iOS) Kotlin/Java (Android) React Native Cordova
Backend:
Node.js REST APIs
DevOps & Cloud:
CI/CD Pipelines Automated Testing AppCenter
Leadership:
Team Mentoring Cross-platform Collaboration Performance Optimization Technical Innovation

Software Engineer

Quby
website

Joined Quby's R&D team developing the Toon Smart Energy Meter. Worked on IoT features and energy monitoring capabilities for Dutch households.

Key Achievements

  • Developed smart home features and energy monitoring capabilities
  • Delivered the first version of Toon's phone and smartwatch apps
  • Built one of the first smartwatch apps to control home thermostats
  • Contributed to IoT features that helped users track and reduce energy consumption

Approach & Impact

  • Delivered features in a fast-paced R&D environment
  • Worked with hardware team to improve data collection
  • Participated in user testing to improve the product

Technology Stack

Mobile:
iOS Android Smartwatch Apps Mobile UI/UX
Backend:
Node.js JavaScript IoT Integration REST APIs
IoT & Hardware:
Embedded Systems Smart Meters Home Energy Management Smart Home Technology

Early Career

Student Assistant

Hogeschool van Amsterdam

Intern

Vattenfall

Junior Software Engineer

Javaland

Junior Software Engineer

Securityalert4you